The author of the survey should have allowed "don't know" as an answer. I didn't finish the survey because I didn't want to choose responses I knew probably we

The author of the survey should have allowed "don't know" as an answer. I didn't finish the survey because I didn't want to choose responses I knew probably weren't the right ones. If there are others like me who refrained for this reason, this will skew the results. (The main point of the survey came across very well, though.)